package com.maomao.admin.service.system.impl;

import com.maomao.admin.common.constant.UserConstants;
import com.maomao.admin.common.core.text.Convert;
import com.maomao.admin.common.exception.ServiceException;
import com.maomao.admin.common.utils.SecurityUtils;
import com.maomao.admin.common.utils.StringUtils;
import com.maomao.admin.common.utils.spring.SpringUtils;
import com.maomao.admin.domain.system.entry.*;
import com.maomao.admin.model.TreeSelect;
import com.maomao.admin.model.annotation.DataScope;
import com.maomao.admin.persistence.repository.SysDeptRepository;
import com.maomao.admin.persistence.repository.SysRoleRepository;
import com.maomao.admin.service.system.ISysDeptService;
import com.querydsl.core.types.Predicate;
import com.querydsl.jpa.impl.JPAQuery;
import com.querydsl.jpa.impl.JPAQueryFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import javax.annotation.Resource;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Iterator;
import java.util.List;
import java.util.stream.Collectors;

/**
 * 部门管理 服务实现
 *
 * @author mao.kaiyin
 */
@Service
public class SysDeptServiceImpl implements ISysDeptService {

    @Autowired
    private SysDeptRepository deptMapper;

    @Autowired
    private SysRoleRepository roleMapper;

    @Resource
    private JPAQueryFactory queryFactory;


    /**
     * 查询部门管理数据
     *
     * @param dept 部门信息
     * @return 部门信息集合
     */
    @Override
    @DataScope(deptAlias = "d")
    public List<SysDept> selectDeptList(SysDept dept) {
        JPAQuery<SysDept> jpaQuery = queryFactory.selectFrom(QSysDept.sysDept);
        List<Predicate> predicates = new ArrayList<>();
        if (dept.getDeptId() != null && dept.getDeptId() != 0) {
            predicates.add(QSysDept.sysDept.deptId.eq(dept.getDeptId()));
        }
        if (dept.getParentId() != null && dept.getParentId() != 0) {
            predicates.add(QSysDept.sysDept.parentId.eq(dept.getParentId()));
        }

        if (StringUtils.isNotBlank(dept.getDeptName())) {
            predicates.add(QSysDept.sysDept.deptName.contains(dept.getDeptName()));
        }

        if (StringUtils.isNotBlank(dept.getStatus())) {
            predicates.add(QSysDept.sysDept.status.eq(dept.getStatus()));
        }
        if (predicates.size() > 0) {
            jpaQuery.where(predicates.toArray(new Predicate[0]));
        }

        return jpaQuery.fetch();
    }

    /**
     * 构建前端所需要树结构
     *
     * @param depts 部门列表
     * @return 树结构列表
     */
    @Override
    public List<SysDept> buildDeptTree(List<SysDept> depts) {
        List<SysDept> returnList = new ArrayList<SysDept>();
        List<Long> tempList = new ArrayList<Long>();
        for (SysDept dept : depts) {
            tempList.add(dept.getDeptId());
        }
        for (SysDept dept : depts) {
            // 如果是顶级节点, 遍历该父节点的所有子节点
            if (!tempList.contains(dept.getParentId())) {
                recursionFn(depts, dept);
                returnList.add(dept);
            }
        }
        if (returnList.isEmpty()) {
            returnList = depts;
        }
        return returnList;
    }

    /**
     * 构建前端所需要下拉树结构
     *
     * @param depts 部门列表
     * @return 下拉树结构列表
     */
    @Override
    public List<TreeSelect> buildDeptTreeSelect(List<SysDept> depts) {
        List<SysDept> deptTrees = buildDeptTree(depts);
        return deptTrees.stream().map(TreeSelect::new).collect(Collectors.toList());
    }

    /**
     * 根据角色ID查询部门树信息
     *
     * @param roleId 角色ID
     * @return 选中部门列表
     */
    @Override
    public List<Long> selectDeptListByRoleId(Long roleId) {
        SysRole role = roleMapper.findById(roleId).get();
        JPAQuery<Long> jpaQuery = queryFactory.select(QSysDept.sysDept.deptId).from(QSysDept.sysDept)
                .leftJoin(QSysRoleDept.sysRoleDept).on(QSysRoleDept.sysRoleDept.id.deptId.eq(QSysDept.sysDept.deptId));

        if (role.isDeptCheckStrictly()) {
            jpaQuery.where(QSysRoleDept.sysRoleDept.id.roleId.eq(roleId));
        } else {
            jpaQuery.where(QSysRoleDept.sysRoleDept.id.roleId.eq(roleId).
                    and(QSysDept.sysDept.deptId.notIn(
                            queryFactory.select(QSysDept.sysDept.parentId).from(QSysDept.sysDept).innerJoin(QSysRoleDept.sysRoleDept).on(QSysDept.sysDept.deptId.eq(QSysRoleDept.sysRoleDept.id.deptId))
                                    .where(QSysRoleDept.sysRoleDept.id.roleId.eq(roleId)))));
        }
        return jpaQuery.fetch();
    }

    /**
     * 根据部门ID查询信息
     *
     * @param deptId 部门ID
     * @return 部门信息
     */
    @Override
    public SysDept selectDeptById(Long deptId) {
        return deptMapper.findById(deptId).orElse(null);
    }

    /**
     * 根据ID查询所有子部门（正常状态）
     *
     * @param deptId 部门ID
     * @return 子部门数
     */
    @Override
    public long selectNormalChildrenDeptById(Long deptId) {
        return queryFactory.select(QSysDept.sysDept.deptId).from(QSysDept.sysDept)
                .where(QSysDept.sysDept.status.eq("0")
                        .and(QSysDept.sysDept.delFlag.eq("0")
                                .and(QSysDept.sysDept.parentId.eq(deptId))))
                .fetchCount();
    }

    /**
     * 是否存在子节点
     *
     * @param deptId 部门ID
     * @return 结果
     */
    @Override
    public boolean hasChildByDeptId(Long deptId) {
        long count = queryFactory.select(QSysDept.sysDept.deptId).from(QSysDept.sysDept)
                .where(QSysDept.sysDept.delFlag.eq("0")
                        .and(QSysDept.sysDept.parentId.eq(deptId)))
                .fetchCount();
        return count > 0;
    }

    /**
     * 查询部门是否存在用户
     *
     * @param deptId 部门ID
     * @return 结果 true 存在 false 不存在
     */
    @Override
    public boolean checkDeptExistUser(Long deptId) {
        long result = queryFactory.selectFrom(QSysUser.sysUser).where(QSysUser.sysUser.delFlag.eq("0").and(QSysUser.sysUser.deptId.eq(deptId))).fetchCount();
        return result > 0;
    }

    /**
     * 校验部门名称是否唯一
     *
     * @param dept 部门信息
     * @return 结果
     */
    @Override
    public String checkDeptNameUnique(SysDept dept) {
        Long deptId = StringUtils.isNull(dept.getDeptId()) ? -1L : dept.getDeptId();
        SysDept info = queryFactory.selectFrom(QSysDept.sysDept).where(QSysDept.sysDept.deptName.eq(dept.getDeptName()).and(QSysDept.sysDept.parentId.eq(deptId))).fetchFirst();
        if (StringUtils.isNotNull(info) && info.getDeptId().longValue() != deptId.longValue()) {
            return UserConstants.NOT_UNIQUE;
        }
        return UserConstants.UNIQUE;
    }

    /**
     * 校验部门是否有数据权限
     *
     * @param deptId 部门id
     */
    @Override
    public void checkDeptDataScope(Long deptId) {
        if (!SysUser.isAdmin(SecurityUtils.getUserId())) {
            SysDept dept = new SysDept();
            dept.setDeptId(deptId);
            List<SysDept> depts = SpringUtils.getAopProxy(this).selectDeptList(dept);
            if (StringUtils.isEmpty(depts)) {
                throw new ServiceException("没有权限访问部门数据！");
            }
        }
    }

    /**
     * 新增保存部门信息
     *
     * @param dept 部门信息
     * @return 结果
     */
    @Override
    public void insertDept(SysDept dept) {
        SysDept info = deptMapper.findById(dept.getParentId()).get();
        // 如果父节点不为正常状态,则不允许新增子节点
        if (!UserConstants.DEPT_NORMAL.equals(info.getStatus())) {
            throw new ServiceException("部门停用，不允许新增");
        }
        dept.setAncestors(info.getAncestors() + "," + dept.getParentId());
        deptMapper.save(dept);
    }

    /**
     * 修改保存部门信息
     *
     * @param dept 部门信息
     * @return 结果
     */
    @Override
    public void updateDept(SysDept dept) {
        SysDept newParentDept = deptMapper.findById(dept.getParentId()).get();
        SysDept oldDept = deptMapper.findById(dept.getDeptId()).get();
        if (StringUtils.isNotNull(newParentDept) && StringUtils.isNotNull(oldDept)) {
            String newAncestors = newParentDept.getAncestors() + "," + newParentDept.getDeptId();
            String oldAncestors = oldDept.getAncestors();
            dept.setAncestors(newAncestors);
            updateDeptChildren(dept.getDeptId(), newAncestors, oldAncestors);
        }
        deptMapper.save(dept);
        if (UserConstants.DEPT_NORMAL.equals(dept.getStatus()) && StringUtils.isNotEmpty(dept.getAncestors())
                && !StringUtils.equals("0", dept.getAncestors())) {
            // 如果该部门是启用状态，则启用该部门的所有上级部门
            updateParentDeptStatusNormal(dept);
        }
    }

    /**
     * 修改该部门的父级部门状态
     *
     * @param dept 当前部门
     */
    private void updateParentDeptStatusNormal(SysDept dept) {
        String ancestors = dept.getAncestors();
        Long[] deptIds = Convert.toLongArray(ancestors);

        List<SysDept> deptList = deptMapper.findAllById(Arrays.asList(deptIds));
        deptList.forEach(item -> item.setStatus("0"));
        deptMapper.saveAll(deptList);
    }

    /**
     * 修改子元素关系
     *
     * @param deptId       被修改的部门ID
     * @param newAncestors 新的父ID集合
     * @param oldAncestors 旧的父ID集合
     */
    public void updateDeptChildren(Long deptId, String newAncestors, String oldAncestors) {
        List<SysDept> children = queryFactory.selectFrom(QSysDept.sysDept).where(QSysDept.sysDept.parentId.eq(deptId)).fetch();
        for (SysDept child : children) {
            child.setAncestors(child.getAncestors().replaceFirst(oldAncestors, newAncestors));
        }
        if (children.size() > 0) {
            deptMapper.saveAll(children);
        }
    }

    /**
     * 删除部门管理信息
     *
     * @param deptId 部门ID
     * @return 结果
     */
    @Override
    public void deleteDeptById(Long deptId) {
        deptMapper.deleteById(deptId);
    }

    /**
     * 递归列表
     */
    private void recursionFn(List<SysDept> list, SysDept t) {
        // 得到子节点列表
        List<SysDept> childList = getChildList(list, t);
        t.setChildren(childList);
        for (SysDept tChild : childList) {
            if (hasChild(list, tChild)) {
                recursionFn(list, tChild);
            }
        }
    }

    /**
     * 得到子节点列表
     */
    private List<SysDept> getChildList(List<SysDept> list, SysDept t) {
        List<SysDept> tlist = new ArrayList<SysDept>();
        Iterator<SysDept> it = list.iterator();
        while (it.hasNext()) {
            SysDept n = (SysDept) it.next();
            if (StringUtils.isNotNull(n.getParentId()) && n.getParentId().longValue() == t.getDeptId().longValue()) {
                tlist.add(n);
            }
        }
        return tlist;
    }

    /**
     * 判断是否有子节点
     */
    private boolean hasChild(List<SysDept> list, SysDept t) {
        return getChildList(list, t).size() > 0;
    }
}
